mcconkey



Oct. 1, 1929. M. w. McCONKEY BRAKING SYSTEM Filed June 13. 1925 2 Sheets-Sheet INVENTOR Oct. 1, 1929. w, MGCONKEY 1,729,887

BRAKING SYSTEM Filed June 13. 1925 2 Sheets-Sheet 2 INVENTOR Patent ed a. 1, 1929.

4 UNITED STATES PAT ENT'O'FFIc f xon'reounnr w. account, or onrcaeo, -rumors, assrenoa 'ro nnnm'x am oouramr, e1- cnrcaeo, rumors, a oonrona'rron or ILLn ors' BRAKING srs'rniu Application filed June 13,

This invention relates to brakes and is illustrated as a novel system of brakes for anautomobile chassis. An object of the invention is to secure reliable but inexpensive connections for operating brakes on the swivelled wheels. To this end the brakes are operated by a novel linkage, shown as a toggle having an operating part movable'in applying the brake substantially into the swivellin axis ofthe wheel, and preferably operated a cable or other tension elemen connected to the operating part.

If it is desired to vary the braking pressure when the wheel is-swivelled, the joint is arranged when the brake is applied slightly at one side of the axis,-on the opposite side from the wheel in the illustratedarrangement, in order tor'elieve the pressure on the brake when the wheel is on the outer side of a turn. While especially intended for brakes on swivelled wheels, the novel brake-operating linkage is also useful'for brakes of other sorts The above and other objects and features of the invention, including various novel combinations of parts and desirable particu; lar constructions, will be a parent from the ings, in which:

Figure 1 is a diagrammatic perspective view showing one arrangement of the. operating connections on an automobile chassis; Figure 2 isa similar view showing the ar- 85 rangement when the outer brake is to be relieved on a turn;

Figure 3 is a section just inside the left front wheel, vertically through the brake;

Figure 4 is a section on the line 4-4 of Figure 3, showing the toggle in bottom plan;

Figure 5 is a diagram representing; a top plan view of the right front wheel an brake,

V and illustrating the manner of relieving the pressure on the outer brake on a turn.

In the arrangement of Figure 1, the chassis comprises rear wheels 10 .havingrbrakes 12,

' sup rting the rear axle 14, and ont wheels 16 aving brakes 18 and swivelled' by the usualking pin or the like at the ends of the 1925. Serial No. 38,848.

front axle 20. Therear brakes 12 are operated by a tension element such as a cable 22 engaged by an equalizing pulley at the end of a link 24,- operated by an arm on a cross shaft 26, and the front brakes 18 are operated by a tension element such as a cable 28 enga by an equalizing pulley on the end of a'hnk or cable 30 also connected to an arm on shaft 26. Shaft -26 is rocked in applying the brakes by a pedal 32.- V 7 The arrangement of Figure 2 differs from that of Figure'll in that the front brakes are not equalized against each other, but are separately operate by tension elements shown as cables 128 connectedto arms on shaft 26.

Preferably cables .4128 pass over pulleys 34 .on the"cha s'sis f-rame (not shown) approximately at the rear ends ofthe front springs (not shown), so that they approach the front brakes approximately, an'angle of 45.

As shown in- Fi re 3, illustrating one particular form of rake which :may be used, each-brake ma include adrum 36 rotating with the .whee ,1 and. a stationary support or backing plate- 38. Between, the drum and backing plate is arranged an exp'ansible fric- -,tion device, which may'include a reverse shoe following description of two Illustrative embodiments shown in the accompanying dr'aw- 40 anchored at 42,- a forward shoe 44 pivoted at 50 to the free end of shoe 48 and anchored at 46. Anchor 46 passes through a relatively 4 so shoe. 48, aiijdnpivotally connected at 59 to one end of a 60 which at-ite other end is i pivoted to shoe 40. The'erid of-link 58 is bent around to form an operating part 62, arranged to be pivotally. connected to the end of one of the ca les, and which in the case of a front brake is movable in thedotted arc Al (Figure 5) to a position substantially in the swivelling axis of the wheel, i. e. the axis of the king-pin 63 of the wheel. An opening 64 in backing plate 38 is provided for part 62. When it is desired to vary the braking when the wheel is swivelled, the joint between straight ahead. -The joint between cable 128 and part 62 is, when the brake is applied, at the point J, to which position it has moved along the dotted arc-A passing through the swivelling axis. When the wheel is swivelled to the right, at which time it is on the outside of the turn, point J moves to J R, slackening off on the cable and relieving the pressure on the brake. Then the wheel is swivelled to the left, on the inner side of the turn, point J moves to J L, ti ghtening up on the cable'and increasing the pressure on the brake.

Y According to an important feature of the invention, I'prefer to adjust the parts in such a manner that in the normal application of the brakes the' point FJ (Figure 5) moves along the dotted are only to the swivelling axis, so that the brake is not ordinarily affected by swivellin the wheel. In an'emergency, however, w en the driver puts his ack against the seat and tries to push the brake pedal through the floor board, thejoint is moved-on to the position shown in Figure 5, so asto insure that the outer brake'will not lock it the car happens to be on a turn. It will be appreciated that the distances shown in Figure 5 are much exaggerated.

While illustrative embodiments of the in-. vent-i on have been described in detail, it is not my intention to limit its scope to those particular embodiments, or otherwise than by the terms of the appended claims.

I claim? A 1. A vehicle having, in combination, a swivelled wheel having a brake, a linkage for operating the brake, and a tension element for operatin the linkage, the joint between the tension e ement and the linkage when the brake is applied being so arranged with .respect to the swivelling axis as to cause variation in the pressure on the brake when the wheel is swivelled.

2. A vehicle having in combination, a swivelled wheel having a brake, a linkage for 4 operating the brake, and a tension element for operating the linkage, the joint between the tension element and the linkage when the brake is applied being on the opposite side of the swivelling axis from the wheel, so as to cause a decrease'in the pressure on the brake when the wheel is swivelled to place it on the outer side of a turn.

3. A vehicle having, in combination, a

I swivelled wheel having an expanding brake,

a toggle for expanding the brake, and a tensionelement for straightening the to gle to expand the brake, the joint between t 'e tension element and the-toggle whenthe brake is applied being on the opposite side of the swivelling axis from the wheel to relieve the pressure on the brake when the wheel is. on' theouter side of a turn. V

4. A vehicle having, in combination, a

, swivelled wheel having an expanding brake,

a toggle for expanding the brake, and a member for straightening the toggle to expand the brake, the joint between the said member and the toggle when the brake is applied being at one side of the swivelling axis to relieve the pressure on the brake when the wheel is on the outer side of a turn.

5. A vehicle having, in combination, a swivelled wheel having a brake, and brake operating means including parts movable in the normal operation of the brake to positions where the, pressure on the brake is substantially unaffected by swivelling the wheel, and which parts are movable by a more vigorous application of the brake to positions where swivelling the wheel varies the pressure on the brake.

6. A vehicle having, in combination, a swivelled wheel havin a brake, and brake operating means inclu ing parts movable in the normal operation of the brake to positions where the pressure on the brake is substantially unaflected by swivelling the wheel, and which parts are movable by a more vigorous application of the .brake to positions where swivelling the wheel to place it on the outside of a turn decreases the pressure on the brake.

7. A vehicle having, in combination, a swivelled Wheel havin a brake, and brake operating means inclu ing a 'oint movable in the normal operation of the brake to a position substantially in the swivelling axis so that swivelling the wheel does not substantially afiect the brake, and movable by a more vigorous operation of the brake to a position slightly atone side of the swivelling axis, so that swivelling the wheel to place it on the outside of a turn will relieve the pressure on the brake.

8. A vehicle having, in combination, a swivelled wheel having a brake, and brake operating means including a brake-applying device and a tension elementhaving a joint movable in the normal operation of the brake to a position substantially in the swivelling axis so that swivelling the wheel does not substantially affect the brake, and movable by'a more vigorous operation of the brake to a position on the opposite side of the swivelling axis their angular positions with respect to their swivelling axes, said connections including levers and a tension element connected to eac lever, the points of connection being movable at. the will of the driver to ositions outside of the swivelling axes to di erenti'ate the action of the brakes when the wheels are swivelled to one side of their straight-ahead positions.

10. A vehicle'having, in combination, swivelled front steering wheels having brakes, and connections arranged normally to 0 rate the brakes substantial y equally regard ess of their angular positions with respect to their swivellin axes, said connections including levers an a tension element connected to eac lever, the points of connection being movable at the will of the driver to 'tions outside of the swivelling axes to di erentiate the action of the brakes when the wheels are swivelled to'one side of their straight-ahead positions to brake the outer wheel less than the inner wheel.

- 11. A vehicle having, in combination, swivelled front steering wheels having brakes, and connections arran ed normally to operate the brakes substantia y equally regardless of their angular positions with respect to their swivellin axes, said connections includin levers an a tension element connected to eacfi lever, the points of connection being movable by a brake-apglying pressure greater than normal to di erentiate the action of the brakes when the wheels are swivelled to one side of their straight-ahead positions.

In testimony whereof I have hereunto signed my name.

MONTGOMERY W. MOCONKEY- 

